In most passive infrared (PIR) motion detection systems, the Fresnel lens has long been treated as a static, well-understood component. It focuses infrared radiation onto a pyroelectric sensor
In this article, we’ll dive into the core principles of PIR detection, explain how materials affect detection performance, and reveal why false alarms are often symptoms of optical misalignment or material mismatches—not just electronic noise.
Passive Infrared (PIR) sensors are among the most widely used motion detection technologies in the world. From automatic lighting and smart thermostats to alarm systems and occupancy monitors, these small devices offer low-cost, low-power solutions to human presence detection.
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Aubor Watch | Industry News · July 2025
